Volume 26 No. 1 & No. 2 2004

Roberta Dizon-Lauzon and Linda B. Mabesa ABSTRACT The essential oil of the aerial part of Coleus amboinicus showed antibacterial activity against Bacillus subtilis (gram +) and Pseudomonas fluorescens (gram -) and antifungal activity against Cladosporium cucumerinum. Bioassay-guided fractionation revealed that carvacrol and ß-caryophyllene-4,5-oxide were the major contributors to the antimicrobial activity of the essential oil. …

Bioassay-guided isolation of the antimicrobial compounds of Coleus amboinicus Loureiro (Lamiaceae) Read More »

Anabella B. Tulin, Victor B. Asio, Dindo M. Campilan and Shigenao Kawai ABSTRACT The nutritional disorders in the leaves, shoots, and root systems of sweetpotato variety PSB SP-17 were evaluated using the solution culture technique. Nutrient deficiency symptoms were established for the following elements: nitrogen, phosphorus,potassium, magnesium, calcium, sulfur, iron and micronutrients. Thirty-six healthy stem …

Characterization of nutrient deficiency symptoms in sweetpotato through farmer-scientist participatory approach Read More »

D. L. S. Tan1, K. Miyamoto2, K. lshibashi3, K. Matsuda4 and T. Satow5 ABSTRACT The performance of the root crop processing machines used in the production of sweetpotato grates and flour was determined. The machines included the Philippine Root Crop Research and Training Center (PhilRootcrops) pedal-operated root crop chipper/ grater, hydraulic presser, spinner, motor-operated attrition …

Evaluation of the technical performance of root crop processing machines for sweetpotato grates and flour production Read More »

Feliciano G. Sinon and Alberto C. Martinez Jr. ABSTRACT An electronic, portable, cheap and easy-to-operate moisture meter was developed and fabricated using the resistivity—conductivity principle of operation which states that the presence of moisture in the fiber conducts electrical current from one terminal end to the other. Its circuitry followed that of the modified wheatstone …

Development of an electronic moisture meter for abaca fiber Read More »

Manuel K. Palomar, Erlinda 0. Landerito, Avelina P. Molato, Doreen S. Cayanong and Victoria G. Palermo ABSTRACT Sequential extractions were done in selected botanicals to test their bioactivity against important fungal pathogens of root crops. Extracts considered as potential fungicide were ampalaya (Momordica charantia) crude ethanolic/acetonic extract to Colletotrichum gleosporoides and Phytophthora colocasiae, asyang (Mikania …

Antifungal activity of six botanicals against root crop diseases Read More »

L. M. Diamante1, M. S. Chinnan2 and P. Mallikurjunan2 ABSTRACT A simple model based on Hukill’s Analysis was used in the simulation of deep bed drying of peanuts at various drying conditions. The model was first evaluated using published drying data and then actual drying experiments at different conditions. The results showed that the simulation …

Deep bed peanut drying using Hukill’s Analysis Read More »

L. M. Diamante1, Ken-ichi Ishibashi2 and Kazunori Hironaka ABSTRACT A study was conducted to determine the adsorption isotherms of dried mangoes at different temperatures. The results showed that the adsorption isotherms of dried mangoes at different temperatures were type III according to the BET classification. At a water activity <0.50,the equilibrium moisture content of samples …

Moisture adsorption isotherms of dried mangoes at a temperature range of 25 to 45°C Read More »

Luz G. Asio1 and Alfredo B. Escasinas2 ABSTRACT This study evaluated the growth and yield responses of corn to chicken dung and rice hull ash application as well as to mycorrhizal fungi inoculation. The experiment was laid out in a split-plot in Randomized Complete Block Design consisting of three replications. Vesicular-arbuscular mycorrhizal (VAM) inoculation served …

Response of corn to chicken dung and rice hull ash application and mycorrhizal fungi inoculation Read More »

Ulysses A. Cagasan1 and Benjamin Agarcio2 ABSTRACT This study was conducted to evaluate the growth and yield of peanut and sweet corn as influenced by timing of planting the crops in an intercropping scheme; determine the appropriate timing of planting peanut and sweet corn in an intercropping scheme for optimum land productivity; and determine the …

Yield and economic returns of peanut and sweetcorn as influenced by timing of planting the crops in an intercropping scheme Read More »